Hi there, remember our coffee night conversation about military shotguns and their effects? I dug out an old manual and came up with these figures. Now I'm no physicist, but I don't see a problem with the effect discussed. A typical energy figure for the common high-brass ("maximum") 12 gauge solid (un-rifled) round is 2360 ft. lbs. I don't have figures for a rifled round, but it can only be higher.